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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Hardware monitoring driver for Maxim MAX86884 *5 * Copyright (c) 2011 Ericsson AB.6 */7 8#include <linux/bitops.h>9#include <linux/kernel.h>10#include <linux/module.h>11#include <linux/init.h>12#include <linux/err.h>13#include <linux/i2c.h>14#include "pmbus.h"15 16#define MAX8688_MFR_VOUT_PEAK 0xd417#define MAX8688_MFR_IOUT_PEAK 0xd518#define MAX8688_MFR_TEMPERATURE_PEAK 0xd619#define MAX8688_MFG_STATUS 0xd820 21#define MAX8688_STATUS_OC_FAULT BIT(4)22#define MAX8688_STATUS_OV_FAULT BIT(5)23#define MAX8688_STATUS_OV_WARNING BIT(8)24#define MAX8688_STATUS_UV_FAULT BIT(9)25#define MAX8688_STATUS_UV_WARNING BIT(10)26#define MAX8688_STATUS_UC_FAULT BIT(11)27#define MAX8688_STATUS_OC_WARNING BIT(12)28#define MAX8688_STATUS_OT_FAULT BIT(13)29#define MAX8688_STATUS_OT_WARNING BIT(14)30 31static int max8688_read_word_data(struct i2c_client *client, int page,32 int phase, int reg)33{34 int ret;35 36 if (page > 0)37 return -ENXIO;38 39 switch (reg) {40 case PMBUS_VIRT_READ_VOUT_MAX:41 ret = pmbus_read_word_data(client, 0, 0xff,42 MAX8688_MFR_VOUT_PEAK);43 break;44 case PMBUS_VIRT_READ_IOUT_MAX:45 ret = pmbus_read_word_data(client, 0, 0xff,46 MAX8688_MFR_IOUT_PEAK);47 break;48 case PMBUS_VIRT_READ_TEMP_MAX:49 ret = pmbus_read_word_data(client, 0, 0xff,50 MAX8688_MFR_TEMPERATURE_PEAK);51 break;52 case PMBUS_VIRT_RESET_VOUT_HISTORY:53 case PMBUS_VIRT_RESET_IOUT_HISTORY:54 case PMBUS_VIRT_RESET_TEMP_HISTORY:55 ret = 0;56 break;57 default:58 ret = -ENODATA;59 break;60 }61 return ret;62}63 64static int max8688_write_word_data(struct i2c_client *client, int page, int reg,65 u16 word)66{67 int ret;68 69 switch (reg) {70 case PMBUS_VIRT_RESET_VOUT_HISTORY:71 ret = pmbus_write_word_data(client, 0, MAX8688_MFR_VOUT_PEAK,72 0);73 break;74 case PMBUS_VIRT_RESET_IOUT_HISTORY:75 ret = pmbus_write_word_data(client, 0, MAX8688_MFR_IOUT_PEAK,76 0);77 break;78 case PMBUS_VIRT_RESET_TEMP_HISTORY:79 ret = pmbus_write_word_data(client, 0,80 MAX8688_MFR_TEMPERATURE_PEAK,81 0xffff);82 break;83 default:84 ret = -ENODATA;85 break;86 }87 return ret;88}89 90static int max8688_read_byte_data(struct i2c_client *client, int page, int reg)91{92 int ret = 0;93 int mfg_status;94 95 if (page > 0)96 return -ENXIO;97 98 switch (reg) {99 case PMBUS_STATUS_VOUT:100 mfg_status = pmbus_read_word_data(client, 0, 0xff,101 MAX8688_MFG_STATUS);102 if (mfg_status < 0)103 return mfg_status;104 if (mfg_status & MAX8688_STATUS_UV_WARNING)105 ret |= PB_VOLTAGE_UV_WARNING;106 if (mfg_status & MAX8688_STATUS_UV_FAULT)107 ret |= PB_VOLTAGE_UV_FAULT;108 if (mfg_status & MAX8688_STATUS_OV_WARNING)109 ret |= PB_VOLTAGE_OV_WARNING;110 if (mfg_status & MAX8688_STATUS_OV_FAULT)111 ret |= PB_VOLTAGE_OV_FAULT;112 break;113 case PMBUS_STATUS_IOUT:114 mfg_status = pmbus_read_word_data(client, 0, 0xff,115 MAX8688_MFG_STATUS);116 if (mfg_status < 0)117 return mfg_status;118 if (mfg_status & MAX8688_STATUS_UC_FAULT)119 ret |= PB_IOUT_UC_FAULT;120 if (mfg_status & MAX8688_STATUS_OC_WARNING)121 ret |= PB_IOUT_OC_WARNING;122 if (mfg_status & MAX8688_STATUS_OC_FAULT)123 ret |= PB_IOUT_OC_FAULT;124 break;125 case PMBUS_STATUS_TEMPERATURE:126 mfg_status = pmbus_read_word_data(client, 0, 0xff,127 MAX8688_MFG_STATUS);128 if (mfg_status < 0)129 return mfg_status;130 if (mfg_status & MAX8688_STATUS_OT_WARNING)131 ret |= PB_TEMP_OT_WARNING;132 if (mfg_status & MAX8688_STATUS_OT_FAULT)133 ret |= PB_TEMP_OT_FAULT;134 break;135 default:136 ret = -ENODATA;137 break;138 }139 return ret;140}141 142static struct pmbus_driver_info max8688_info = {143 .pages = 1,144 .format[PSC_VOLTAGE_IN] = direct,145 .format[PSC_VOLTAGE_OUT] = direct,146 .format[PSC_TEMPERATURE] = direct,147 .format[PSC_CURRENT_OUT] = direct,148 .m[PSC_VOLTAGE_IN] = 19995,149 .b[PSC_VOLTAGE_IN] = 0,150 .R[PSC_VOLTAGE_IN] = -1,151 .m[PSC_VOLTAGE_OUT] = 19995,152 .b[PSC_VOLTAGE_OUT] = 0,153 .R[PSC_VOLTAGE_OUT] = -1,154 .m[PSC_CURRENT_OUT] = 23109,155 .b[PSC_CURRENT_OUT] = 0,156 .R[PSC_CURRENT_OUT] = -2,157 .m[PSC_TEMPERATURE] = -7612,158 .b[PSC_TEMPERATURE] = 335,159 .R[PSC_TEMPERATURE] = -3,160 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP161 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT162 | PMBUS_HAVE_STATUS_TEMP,163 .read_byte_data = max8688_read_byte_data,164 .read_word_data = max8688_read_word_data,165 .write_word_data = max8688_write_word_data,166};167 168static int max8688_probe(struct i2c_client *client)169{170 return pmbus_do_probe(client, &max8688_info);171}172 173static const struct i2c_device_id max8688_id[] = {174 {"max8688"},175 { }176};177 178MODULE_DEVICE_TABLE(i2c, max8688_id);179 180/* This is the driver that will be inserted */181static struct i2c_driver max8688_driver = {182 .driver = {183 .name = "max8688",184 },185 .probe = max8688_probe,186 .id_table = max8688_id,187};188 189module_i2c_driver(max8688_driver);190 191MODULE_AUTHOR("Guenter Roeck");192MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688");193MODULE_LICENSE("GPL");194MODULE_IMPORT_NS(PMBUS);195